Safety and efficacy of abobotulinumtoxinA for hemiparesis in adults with upper limb spasticity after stroke or traumatic brain injury: a double-blind randomised controlled trial. Lancet Neurol. 2015 Oct;14(10):992-1001. doi: 10.1016/S1474-4422(15)00216-1.
It usually consists of a court of final appeal (called the  Supreme court  or  Constitutional court ), together with lower courts. In many jurisdictions the judicial branch has the power to change laws through the process of judicial review.
In other words, each branch helps balance against the other branches by checking their powers. The other branches of the government can check the judicial branch through the nomination and appointment process. The actual people who make up the judicial branch, the judges and justices, must be nominated by the executive branch and approved by the legislative branch. This gives the other branches of government an important say in what kind of people will work for the judicial branch.